"It wasn't my best tennis," Sharapova said. "It was
scrappy tennis but sometimes those kind of matches are a lot
of fun and this was one of those days."

The 30-year-old Russian, who next faces Russian-born US
teen Sofia Kenin, tested positive for meldonium at the 2016
Australian Open, her most recent Grand Slam appearance until
this week.

"Every day I have the chance I have to play at the US
Open is a special day and I'll look forward to the next one,"
146th-ranked Sharapova said.

Sharapova, whose five Grand Slam titles include the 2006
US Open, played only one Open tuneup match after a forearm
injury but wore down Halep and Babos to prove she's a threat
for a deep run, with Latvian 16th seed Anastasija Sevastova
her top-ranked potential semi-final obstacle.

Shapovalov became the youngest man in the third round of
a Grand Slam since Bernard Tomic at the 2011 Australian Open
and at the US Open since American Donald Young in 2007.

- Muguruza breaks 'curse' -

===========================

Wimbledon champion Garbine Muguruza reached the US Open
third round for the first time by beating China's 92nd-ranked
Duan Ying-Ying 6-4, 6-0.

"I had like a curse and I broke it finally. I'm so
happy," Muguruza said. "I just put the heart on the court. I
knew I had to be all the time fighting for the ball and in the
end I won."

Beating Slovakian 31st seed Magdalena Rybarikova to reach
the last 16 would make the Spanish third seed the leader in a
seven-woman fight for world number one.

Russian eighth seed Svetlana Kuznetsova, the 2004 US Open
champion, rescued three match points in defeating 67th-ranked
Czech Marketa Vondrousova 4-6, 6-4, 7-6 (7/2) to reach the
second round to stay in that hunt.